Brian Bolland was slated to be the artist for the cover.
From Brian Bolland's Blog:
"Unfortunately my artwork for the She-Hulk cover turned up a day late for Marvel Comics. In Marvel's haste to get a cover on this issue they got someone in the Marvel office to trace over my rough and produce a quick but on-time version of this picture which graced the cover of this issue." (9 October 2011 16:12)
Direct edition copies were released with a loose outside cover featuring the intended Bolland art. The extra cover explains the mix-up.